Orish C N, Didia B C, Fawehinmi H B
Department of Anatomy, Faculty of Basic Medical Sciences, University of Port-Harcourt, PMB 5323, Choba, Port Harcourt, Rivers State, Nigeria.
Anat Res Int. 2014;2014:747239. doi: 10.1155/2014/747239. Epub 2014 May 18.
Background. Determination of sex is an important concern to the forensic anthropologists as it is critical for individual identification. This study has investigated the existence of sexual dimorphism in the dimensions and the area of the IOA triangle. Methods. A total of 100 adult dry skulls, (78 males; 22 females) from departments of anatomy in Nigerian universities were used for this study. Automatic digital calliper was used for the measurement. Coefficient of variation, correlation, linear regression, percentiles, and sexual dimorphism ratio were computed from the IOA triangle measurements. The IOA triangle area was compared between sexes. Results. The male parameters were significantly (P < 0.05) higher than female parameters. The left opistocranium-asterion length was 71.09 ± 0.56 and 61.68 ± 3.35 mm and the right opistocranium-asterion length was 69.73 ± 0.49 and 60.92 ± 2.10 mm for male and female, respectively. A total area of IOA triangle of 1938.88 mm(2) and 1305.68 mm(2) for male and female, respectively, was calculated. The left IOA indices were 46.42% and 37.40% in males and females, respectively, while the right IOA indices for males and females were 47.19% and 38.87%, respectively. Conclusion. The anthropometry of inion-opistocranium-asterion IOA triangle can be a guide in gender determination of unknown individuals.
背景。性别判定是法医人类学家的一项重要工作，因为它对个体识别至关重要。本研究调查了枕骨大孔区（IOA）三角形尺寸和面积上的性别二态性。方法。本研究使用了来自尼日利亚各大学解剖学系的100个成人干燥颅骨（78例男性；22例女性）。测量使用自动数字卡尺。根据IOA三角形测量数据计算变异系数、相关性、线性回归、百分位数和性别二态性比率。对两性之间的IOA三角形面积进行比较。结果。男性参数显著高于女性参数（P < 0.05）。男性和女性的左枕骨大孔-星点长度分别为71.09 ± 0.56和61.68 ± 3.35毫米，右枕骨大孔-星点长度分别为69.73 ± 0.49和60.92 ± 2.10毫米。计算得出男性和女性的IOA三角形总面积分别为1938.88平方毫米和1305.68平方毫米。男性和女性的左IOA指数分别为46.42%和37.40%，而男性和女性的右IOA指数分别为47.19%和38.87%。结论。枕骨大孔-枕骨-星点IOA三角形的人体测量学特征可作为判定未知个体性别的指导依据。
